SilencerCo AC28 Osprey/Octane Piston 16M x 1LH 45 ACP Stainless Steel – Precision Suppressor Adapter

The SilencerCo AC28 Osprey/Octane piston is a precision suppressor adapter engineered to swap between your centerfire hosts and subcaliber platforms. Built from 17-4 stainless steel and heat-treated for durability, this 16M x 1LH threaded piston for 45 ACP contains the female threads that mount to your barrel, allowing the Nielsen device mechanism to function and cycle semi-automatic fire. It's the key to unlocking multi-caliber capability—swap pistons to shoot different rounds through the same suppressor body, maximizing your investment in a modular silencer system.

SilencerCo's piston-based design is the backbone of their modular suppressor platform. This AC28 piston is interchange-compatible across the OMEGA K Series, Osprey, Octane, and Hybrid 46 families, meaning you can adapt your suppressor from one host gun to another or drop down to subcaliber ammunition without swapping the entire can. That modularity is huge for shooters who run multiple platforms or want to suppress different caliber hosts with a single suppressor body.

If you're running a 45 ACP host and want to integrate your SilencerCo suppressor seamlessly, this piston handles the mechanical work—the Nielsen action allows the slide to cycle normally while the piston's female threads anchor the suppressor to your muzzle. Whether you're a serious precision shooter, a defensive pistol enthusiast, or someone building out a versatile suppressor ecosystem, having the right piston on hand means you're ready to switch platforms in seconds.

Key Features

• 17-4 stainless steel construction with heat treatment for maximum durability
• Female 16M x 1LH threads for 45 ACP hosts
• Nielsen device mechanism enables semi-automatic cycling
• Interchangeable across SilencerCo OMEGA K, Osprey, Octane, and Hybrid 46 suppressor families
• Modular design allows subcaliber shooting through the same suppressor body
• Swap-ready—quickly change hosts or calibers without a gunsmith

Specifications

Frequently Asked Questions

What suppressors does this AC28 piston work with?

This piston is interchange-compatible with SilencerCo's OMEGA K Series, Osprey, Octane, and Hybrid 46 suppressors. It contains the female threads and Nielsen mechanism required for those platforms.

Can I use this piston to shoot different calibers through the same suppressor?

Yes. The piston-based design of SilencerCo's suppressor family allows you to swap pistons to accommodate different host guns and subcaliber ammunition, making it a true multi-caliber silencer when paired with the appropriate piston set.

What are the thread specifications for this piston?

The AC28 piston features 16M x 1LH threads, designed to fit 45 ACP hosts. The female threads mount to your host pistol's barrel.

How does the Nielsen device mechanism work with this piston?

The Nielsen mechanism inside the piston allows the slide to cycle normally during semi-automatic fire. The piston moves within the suppressor body as part of this action, which is essential for reliable function on blowback and recoil-operated pistols.